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Bull sharks mate during late summer and early autumn, [10] often in bays and estuaries. [57] After gestating for 12 months, a bull shark may give birth to 1 to 13 live young. [10] [58] They are viviparous, born live and free-swimming. The young are about 70 cm (27.6 in) at birth.
Bull shark Historically responsible for an incident in Matawan, New Jersey in 1916 that inspired the film Jaws, [14] this species is known to be more and aggressive than the larger great white, which cannot survive in fresh water. [15] Bull sharks can swim up freshwater rivers and are present in the area from May–September.
As evidence of these movements, bull sharks tagged inside the lake have later been caught in the open ocean (and vice versa), with some taking as little as 7–11 days to complete the journey. [7] Numerous other species of fish live in the lake, including at least 16 cichlids that are endemic to the general region
While the majority of sharks are solely marine, a small number of shark species have adapted to live in freshwater. The river sharks (of the genus Glyphis) live in freshwater and coastal marine environments. The bull shark (Carcharhinus leucas), can swim between salt and fresh water, and are found in tropical rivers around the world.
Sharks are found in all seas. They generally do not live in fresh water, with a few exceptions such as the bull shark and the river shark which can swim both in seawater and freshwater. [99] Sharks are common down to depths of 2,000 metres (7,000 ft), and some live even deeper, but they are almost entirely absent below 3,000 metres (10,000 ft).
Bull sharks: Copper shark: Carcharhinus brachyurus: Carcharhinidae Vulnerable [15] Copper shark: Basking shark: Cetorhinus maximus: Cetorhinidae: Endangered [16] Basking shark: Frilled shark: Chlamydoselachus anguineus: Chlamydoselachidae: Least concern [17] Frilled shark in Aquarium Tropical at Palais de la Porte Dorée: Horn shark ...
The Galapagos bullhead shark, Heterodontus quoyi, is a bullhead shark of the family Heterodontidae found in the tropical eastern Pacific Ocean between latitudes 0° to 10°S, at depths between 3 and 40 m. It can reach a length of 1.07 m.
Bull sharks can grow up to between 7–11.5 feet (2.1–3.5 m) in length and be very aggressively territorial, which are unusual for a shark species because they can inhabit brackish water (containing less than 50% seawater) and are known to tolerate freshwater. [89]